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| author | Steve Capper <steve.capper@arm.com> | 2019-08-07 16:55:22 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2019-08-09 11:17:26 +0100 |
| commit | b6d00d47e81a49f6cf462518c10408f37a3e6785 (patch) | |
| tree | f84df6281b176ab0f3c2fea47d8b9ef233f15b6a /arch/arm64/Kconfig | |
| parent | ce3aaed87344c83c77135f80e7b76e1da9c92ee6 (diff) | |
| download | lwn-b6d00d47e81a49f6cf462518c10408f37a3e6785.tar.gz lwn-b6d00d47e81a49f6cf462518c10408f37a3e6785.zip | |
arm64: mm: Introduce 52-bit Kernel VAs
Most of the machinery is now in place to enable 52-bit kernel VAs that
are detectable at boot time.
This patch adds a Kconfig option for 52-bit user and kernel addresses
and plumbs in the requisite CONFIG_ macros as well as sets TCR.T1SZ,
physvirt_offset and vmemmap at early boot.
To simplify things this patch also removes the 52-bit user/48-bit kernel
kconfig option.
Signed-off-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index f7f23e47c28f..f5f7cb75a698 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -286,7 +286,7 @@ config PGTABLE_LEVELS int default 2 if ARM64_16K_PAGES && ARM64_VA_BITS_36 default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42 - default 3 if ARM64_64K_PAGES && (ARM64_VA_BITS_48 || ARM64_USER_VA_BITS_52) + default 3 if ARM64_64K_PAGES && (ARM64_VA_BITS_48 || ARM64_VA_BITS_52) default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39 default 3 if ARM64_16K_PAGES && ARM64_VA_BITS_47 default 4 if !ARM64_64K_PAGES && ARM64_VA_BITS_48 @@ -300,12 +300,12 @@ config ARCH_PROC_KCORE_TEXT config KASAN_SHADOW_OFFSET hex depends on KASAN - default 0xdfffa00000000000 if (ARM64_VA_BITS_48 || ARM64_USER_VA_BITS_52) && !KASAN_SW_TAGS + default 0xdfffa00000000000 if (ARM64_VA_BITS_48 || ARM64_VA_BITS_52) && !KASAN_SW_TAGS default 0xdfffd00000000000 if ARM64_VA_BITS_47 && !KASAN_SW_TAGS default 0xdffffe8000000000 if ARM64_VA_BITS_42 && !KASAN_SW_TAGS default 0xdfffffd000000000 if ARM64_VA_BITS_39 && !KASAN_SW_TAGS default 0xdffffffa00000000 if ARM64_VA_BITS_36 && !KASAN_SW_TAGS - default 0xefff900000000000 if (ARM64_VA_BITS_48 || ARM64_USER_VA_BITS_52) && KASAN_SW_TAGS + default 0xefff900000000000 if (ARM64_VA_BITS_48 || ARM64_VA_BITS_52) && KASAN_SW_TAGS default 0xefffc80000000000 if ARM64_VA_BITS_47 && KASAN_SW_TAGS default 0xeffffe4000000000 if ARM64_VA_BITS_42 && KASAN_SW_TAGS default 0xefffffc800000000 if ARM64_VA_BITS_39 && KASAN_SW_TAGS @@ -759,13 +759,14 @@ config ARM64_VA_BITS_47 config ARM64_VA_BITS_48 bool "48-bit" -config ARM64_USER_VA_BITS_52 - bool "52-bit (user)" +config ARM64_VA_BITS_52 + bool "52-bit" depends on ARM64_64K_PAGES && (ARM64_PAN || !ARM64_SW_TTBR0_PAN) help Enable 52-bit virtual addressing for userspace when explicitly - requested via a hint to mmap(). The kernel will continue to - use 48-bit virtual addresses for its own mappings. + requested via a hint to mmap(). The kernel will also use 52-bit + virtual addresses for its own mappings (provided HW support for + this feature is available, otherwise it reverts to 48-bit). NOTE: Enabling 52-bit virtual addressing in conjunction with ARMv8.3 Pointer Authentication will result in the PAC being @@ -778,7 +779,7 @@ endchoice config ARM64_FORCE_52BIT bool "Force 52-bit virtual addresses for userspace" - depends on ARM64_USER_VA_BITS_52 && EXPERT + depends on ARM64_VA_BITS_52 && EXPERT help For systems with 52-bit userspace VAs enabled, the kernel will attempt to maintain compatibility with older software by providing 48-bit VAs @@ -795,7 +796,8 @@ config ARM64_VA_BITS default 39 if ARM64_VA_BITS_39 default 42 if ARM64_VA_BITS_42 default 47 if ARM64_VA_BITS_47 - default 48 if ARM64_VA_BITS_48 || ARM64_USER_VA_BITS_52 + default 48 if ARM64_VA_BITS_48 + default 52 if ARM64_VA_BITS_52 choice prompt "Physical address space size" |